Cited by 293Mitochondrial Function and PathologyMuscle Physiology and DisordersAdipose Tissue and Metabolism

Mitochondrial Dynamics Is a Distinguishing Feature of Skeletal Muscle Fiber Types and Regulates Organellar Compartmentalization

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Mishra, Prashant, Varuzhanyan, Grigor, Pham, Anh H., Chan, David C.·2015·Cell Metabolism

Abstract

Skeletal muscle fibers differentiate into specific fiber types with distinct metabolic properties determined by their reliance on oxidative phosphorylation (OXPHOS). Using in vivo approaches, we find that OXPHOS-dependent fibers, compared to glycolytic fibers, contain elongated mitochondrial networks with higher fusion rates that are dependent on the mitofusins Mfn1 and Mfn2. Switching of a glycolytic fiber to an oxidative IIA type is associated with elongation of mitochondria, suggesting that mitochondrial fusion is linked to metabolic state. Furthermore, we reveal that mitochondrial proteins are compartmentalized to discrete domains centered around their nuclei of origin. The domain dimensions are dependent on fiber type and are regulated by the mitochondrial dynamics proteins Mfn1, Mfn2, and Mff. Our results indicate that mitochondrial dynamics is tailored to fiber type physiology and provides a rationale for the segmental defects characteristic of aged and diseased muscle fibers.

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Crossref · 10.1016/j.cmet.2015.09.027

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  • Type I muscle fibres display a different mitochondrial topology compared with type II fibres, with mitochondria appearing more elongated and 'string-like'.

    “type I muscle fibres have been shown to display a different mitochondrial topology compared with type II fibres, with mitochondria appearing more elongated and ‘string-like’ [43].”

    From Human skeletal muscle mitochondrial dynamics in relation to oxidative capacity and insulin sensitivity (2021) · cites this paper as [43]

    The Results and Discussion describe elongated, interconnected mitochondria in type I fibres, in contrast to the punctate mitochondria of glycolytic type IIX/IIB fibres. But type IIA fibres also have elongated mitochondria resembling those in type I fibres, so the distinction does not hold for type II fibres as a whole. The supplied passages have no page numbers. (LLM, conf=0.88)

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  • The mitochondrial network morphology, arrangement, and connectivity adapt to each fiber type's specific functional needs (e.g., OXPHOS capacity and contractility).

    “Therefore, the mitochondrial network morphology, arrangement, and connectivity adapt to each fiber type's specific functional needs (e.g., OXPHOS capacity and contractility) [31, 32].”
  • Mitochondrial morphology and dynamics differ across muscle fiber types.

    “Other studies have also highlighted that mitochondrial morphology and dynamics differ across muscle fiber types [61,66,67].”

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Authors
Mishra, P., Varuzhanyan, G., Pham, A. H., & Chan, D. C.
Affiliations
California Institute of Technology (US)
Corresponding author
Chan, David C.
Venue
Cell Metabolism
Publisher
Elsevier BV
Published
2015-12
Volume
22
Issue
6
Pages
1033-1044
ISSN
1550-4131 (ISSN-L)
OpenAlex
W1940751968
Cited by
290
References
49
Citations by year
2026: 18 · 2025: 22 · 2024: 45 · 2023: 44 · 2022: 28 · 2021: 29 · 2020: 36 · 2019: 20 · 2018: 22 · 2017: 11 · 2016: 15
FWCI
6.94
Type
journal article
Language
en
Open access
Locations
  • Cell Metabolism (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
Funders
National Institute of General Medical Sciences (R01GM062967, R25GM076162, GM062967, T32 GM0076162, R01GM110039)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
Keywords
mitochondrial dynamics, skeletal muscle fiber types, mitochondrial fusion, mitofusins, Mfn1, mitofusin 2, mitochondrial fission, Mff, oxidative phosphorylation, glycolytic fibers, mitochondrial compartmentalization, muscle aging, myopathy
MeSH terms
Animals, Luminescent Proteins, Membrane Proteins, Mice, Transgenic, Microscopy, Electron, Mitochondria, Oxidative Phosphorylation, Muscle Fibers, Skeletal, GTP Phosphohydrolases, Mitochondrial Proteins, Mice, Gene Knock-In Techniques, Time-Lapse Imaging, Mitochondrial Dynamics

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